288 



APPENDIX 



other compounds in a solution of dex- 

 trose (Konig, Spieckermann, and Olig, 

 Journ. Ch. Soc. 84, II, 386). The 

 presence of acetic aldehyde in oil of 

 peppermint has been confirmed by 

 Charabot and Hebert (Ann. Agronom. 

 28, 595). 



To be added to synthetical pro- 

 cesses : 



[A, p. 175.] Ethylene oxide is com- 

 pletely converted into acetic aldehyde 

 by the ' contact ' action of alumina on 

 the vapour at 200 (Ipatieff and Leonto- 

 witsch, Ber. 36, 2016). 



[B, p. 175.] Acetic aldehyde is among 

 the products of oxidation of ethane by 

 ozone (Bone and Drugman, Proc. Ch. 

 Soc. 2O, 127). 



[C, p. 175.] For further study of the 

 oxidation of alcohol to aldehyde from 

 the electrochemical point of view see 

 paper by Slaboszewicz, Zeit. physik. 

 Ch. 42, 343. The production of alde- 

 hyde from alcohol vapour by pyrogenic 

 decomposition at 500 is referred to by 

 Berthelot, 'Traite de Ch. Org/ 1872, 

 p. 164. For further researches on the 

 pyrogenic ' contact ' conversion of alco- 

 hol into aldehyde, &c., by heated metals 

 and metallic oxides see paper by Ipatieff, 

 Ber. 36, 1990. 



94. Butyric Aldehyde (p. 181). 



To be added to synthetical pro- 

 cesses : 



[D, p. 182.] For production of iso- 

 butyric aldehyde from isobutylene oxide 

 by the ' contact ' action of alumina on 

 the vapour at 200 see paper by Ipatieff 

 and Leontowitsch, Ber. 36, 2016. 



95. Valeric Aldehyde (p. 183). 



A valeric aldehyde occurs in pepper- 

 mint oil from Mentha piperita (Charabot 

 and Hebert, Ann, Agronom. 28, 595). 

 A valeric aldehyde is possibly present 

 in lavender oil (SchimmeFs Ber. April, 

 1903; Ch. Centr. 1903, 1, 1086). 



96. Hexoic Aldehyde (p. 185). 

 Methylpropylacetaldehyde. 



To be added to synthetical pro- 

 cesses : - 



[A, p. 185.] Propylene oxide, when 



the vapour is passed through a tube 

 containing aluminium oxide heated to 

 200, is resolved chiefly into propionic 

 aldehyde (Ipatieff and Leontowitsch, 

 Ber. 36, 2016). 



100. Decoic Aldehyde (p. 189). 



The occurrence of this aldehyde in 

 neroli oil is recorded by Walbaum and 

 Hiithig (Journ. pr. Ch. [2] 67, 315 : 

 see also Hesse and Zeitschel, Ibid. 66, 

 481). The aldehyde has been found in 

 the oil of cassia flowers from Acacia 

 cavenia (Walbaum, Ibid. 68, 235). 



1O1. Acrolem (p. 190). 



To be added to synthetical pro- 

 cesses : 



[A, p. 190.] Glycerol gives acrolei'n 

 when heated with succinic acid, with 

 d-tartaric acid, or with malic acid (OE. 

 de Coninck and Raynaud, Comp. Rend. 

 135, 1351). 



102. Crotoiiic Aldehyde (p. 190). 



Solanin, a gluco-alkaloid found in 

 the berries of Solatium nigrum, S. dulca- 

 mara, 8. verbascifolium, in stalks and 

 leaves of S. lycopersicum, and in shoots 

 of the potato, apparently contains the 

 cro tonic aldehyde complex (Hilger and 

 Merkens, Ber. 36, 3204). 



To be added to synthetical pro- 

 cesses : 



[J, p. 190.] From glycol [45], cro- 

 tonic aldehyde being among the pro- 

 ducts of decomposition of this com- 

 pound by zinc chloride at 250 (Bauer, 

 ( Repertoire de Chimie Pure/ 2 [1860], 

 244)- 



104. Citral (p. 191). 



For occurrence of citral in verbena 

 oil from Verbena triphylla see paper by 

 Theulier, Bull. Soc. [3] 27, 1113. 



NOTE : Since the rhodinal of Bouveault (see 

 under citronellal [105, p. 192]) is the aldehyde 

 derived from 1-citronellol =rhodinol [38, p. 89 ; 

 A, note, and this appendix, p. 282] and is not 

 identical with citral, the synonyms rhodinal 

 and licareal given for the latter (p. 191) must 

 be deleted. Rhodinal has not yet been shown 

 to be a natural product. 



